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AWWA MTC61157
- Modeling of the Fouling Mechanisms Occurring in Low-Pressure Membranes During Organic Fouling by Municipal Wastewater
- Conference Proceeding by American Water Works Association, 03/01/2005
- Publisher: AWWA
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Bench-scale stirred cell tests are performed with various feed waters (WWTPeffluents, effluent isolates) on four microfiltration (MF) and ultrafiltration (UF) membranes. Filtration tests are carriedout at constant transmembrane pressure, i.e. the flux decline is monitored over time.The resulting flux data is used for modeling. The flux data collected during membranefiltration experiments can be examined for the prevailing fouling mechanism byreplotting the data using characteristic coordinates, e.g. a linear plot of time/volumeversus volume is found in the case of cake formation. The flux decline observedduring stirred cell experiments with municipal wastewater through ultrafiltrationmembranes can be explained by the cake formation model. Microfiltrationmembranes with pore sizes of 0.1-0.22 µm, on the other hand, are fouled by morecomplex mechanisms. Neither of the classical fouling models can explain theobserved flux decline behavior alone. Thus, a combination of several foulingmechanisms can therefore be inferred. Includes 5 references, tables, figures.
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